Caption: View of Tevatron in A-Sector inside the Main Ring Tunnel. Fermilab's Tevatron is the world's highest-energy particle accelerator and collider. In the Tevatron, counter-rotating beams of protons and antiprotons produce collisions allowing scientists to examine the most basic building blocks of matter, and the forces acting on them. Particle physics research has grown into an international effort, with experiment collaborations numbering in the hundreds.